Clark81'

@article{DBLP:journals/ibmsj/Clark81,
  author    = {Ian A. Clark},
  title     = {Software Simulation as a Tool for Usable Product Design},
  journal   = {IBM Systems Journal},
  volume    = {20},
  number    = {3},
  year      = {1981},
  pages     = {272-293},
  ee        = {http://dx.doi.org/10.1147/sj.203.0272},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}